Portion of a watch case



FIG. 1 is a front elevational view of a portion of a watch case, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a front, bottom and right side perspective view thereof.

The structure depicted by means of broken lines in the figures has been shown for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a watch case, as shown and described. 